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    SubjectRe: [PATCHv2 1/2] ARM: mx51: Implement code to allow mx51 to enter WFI
    Hi David,

    On Tue, Mar 08, 2011 at 12:40:23PM +0100, David Jander wrote:
    >
    > Hi Sascha,
    >
    > On Mon, 7 Mar 2011 19:07:00 +0100
    > "s.hauer@pengutronix.de" <s.hauer@pengutronix.de> wrote:
    > >[...]
    > > > The current imx for-next tree is not booting on my Babbage board. Is
    > > > it okay for you with your HW. I'll have to debug the booting part
    > > > first.
    > >
    > > Probably because other than kconfig states i.MX51 and i.MX53 cannot be
    > > compiled in one kernel. the for-next branch boots fine on my babbage.
    >
    > Would you mind explaining (or pointing to an explanation) as to why this is
    > not supposed to work? Given the high level of compatibility between MX51 and
    > MX53, I'd say there must be a very good reason not to enable a single binary
    > kernel for both. Or is this just temporary brokenness?

    i.MX51 and i.MX53 have different phys_offsets. Look at
    arch/arm/mach-mx5/Makefile.boot:

    zreladdr-$(CONFIG_ARCH_MX50) := 0x70008000
    params_phys-$(CONFIG_ARCH_MX50) := 0x70000100
    initrd_phys-$(CONFIG_ARCH_MX50) := 0x70800000
    zreladdr-$(CONFIG_ARCH_MX51) := 0x90008000
    params_phys-$(CONFIG_ARCH_MX51) := 0x90000100
    initrd_phys-$(CONFIG_ARCH_MX51) := 0x90800000
    zreladdr-$(CONFIG_ARCH_MX53) := 0x70008000
    params_phys-$(CONFIG_ARCH_MX53) := 0x70000100
    initrd_phys-$(CONFIG_ARCH_MX53) := 0x70800000

    Compiling a kernel for i.MX50 and i.MX53 will work, but compiling a
    kernel for i.MX51 and i.MX53 will and up with a kernel assuming SDRAM
    at 0x70000000 which will fail on a i.MX51. We need
    phys_to_virt/virt_to_phys runtime patching to get this right. This
    will be merged in the next merge window.

    Sascha

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